Reactoonz by Play’n GO features a vibrant sci-fi theme set on a 5×5 cluster grid with quirky cartoon alien symbols. Wins are made from groups of five or more matching symbols. Each winning cluster fills Gargantoon’s Quantum Leap meter, which can activate one of four Quantum Features. When the meter reaches Gargantoon, he appears as a 3×3 wild on the grid. Additionally, forming a square of four matching normal symbols creates a Giantoonz, doubling wins for any combinations involving the Giantoonz.